The blowhole bursts spectacularly right next to the buildings in a medieval seaside town.

The most elaborate of 12 medieval arched doorways to the old city of Burgos.

This colorful statue welcomes visitors to a Barcelona park.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

The Roman city was the birthplace of various emperors and is home to one of the empire's most impressive architectural feats.

The ruins of an ancient stadium that hosted gripping chariot and horse races.

Two towns are linked by an engineering marvel masquerading as a boring suspension bridge.

This 47-story "M" needed 20 years to be completed

Giant topiary dog once played a role in a terrorist bomb plot.

Vibrant street art created with mixed media.

A network of hundreds of interconnected wineries in caves hides under the town center.

This line of 12 tower mills described in the story of Don Quixote is among the most iconic landscapes in Spain.